AHDL is used and FPGA device is chosen as target device in designing the intelligent traffic light control system, in which up to down designing method is applied.

使用AHDL语言，目标器件选用FPGA器件，采用自上向下的设计方法，设计智能交通灯控制系统。

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The paper introduces the method of PLC control in traffic light and the saving method of the out-point of PLC.

本文主要介绍了PLC控制全功能交通灯的实现方法，以及节省PLC输出点的一种实现途径。

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Secondly, the framework and method of virtual experiment subsystem of control system network laboratory is presented. Developed traffic light control and DC motor control are introduced in the detail.

其次，介绍了控制系统网络虚拟实验子系统的构架和虚拟实验实现方法，并为虚拟实验子系统开发了交通灯控制和电机控制两个虚拟实验。

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